Edward weston



(No Model.)

E. WESTON.

RHEOSTAT. No. 340,398. Patented Apr: 20, 1886.

WITNESSES: INVENTOR n. FEVER; Vin-Mm 0.6.

UNITED STATES EDlVARD \VESTON,

PATENT OFFICE. E

OF NEWVARK, NE\V JERSEY, ASSIGNOR TO THE UNITED RH EO STAT.

SPECIFICATION forming part of Letters Patent No. 340,398, dated April. 20, 1886.

Application filed October 13, 1885. Serial No. 179,768.

To all whom it may concern.-

Be itkuown that I, EDWARD \VEs'roN, a subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Rheost-ats,of which the following is a specification, reference being had to the drawing accompanying and forming a part of the same.

My invention relates to resistance-boxes or rheostats; and it consists in a novel means for inclosing or protecting the same.

The resistance-boxes or rheostats to which my invention is applicable are those for use with dynamo-electric machines, regulators, and the like, and consists of a frame of insulating material containing a long brass or German silver or other wire connected with contact-plates. Usually the wire is in numerous coils or spirals, and sometimes it is wound on plates, rods,or tubes. To inclose or protect the coils a perforated wooden box or cover has generally been used. rent is passed through the coils, they are apt to become heated;hence it is desirable to have as perfect ventilation through the box as possible,in order to cool the coils. \Vith this in view I have devised a form of cover that is at once cheaper and more effective than those used before. This cover I make of wire-gauze, either in a single piece or in several pieces hen a strong cur (N0 model.)

\ united together so as to cover all but one side of the frame containing the coils. The frame is secured to a board or plate, by which the l resistance-box is attached to the wall or other support. This is shown in the accompanying drawing, which represents a resistancebox in perspective with a portion of the casing or cover removed.

A is the base-board or back, by means of l which the device is secured to a support. l B is a wooden or insulating frame, and C O l are rods of insulating material supported in l this frame and having the resistance wire or 1 wires wound on them.

D is a wire-gauze cover that incloses the frame and coils. It is made in one or several pieces, as may be preferred, and the mesh es l are of such size as to prevent access of solid particles ofa size to injure the coils, but to se I cure a free ventilation. The arrangement of t coils within the netting is immaterial.

\Vhat I claim is I The combination, with an insulating-frame l and resistancecoils contained therein, of an inclosing cover or casing made of wiregauze,

as and for the purpose set forth.

EDlVARD \VESTON.

RICHARD WM. BLOEMEKE,

\Vitnesses:

FRANK N. CRANE. 

